/ Experiment-HEP arXiv:0707.0589

Observation and mass measurement of the baryon Xi(b)-

Published in: Phys.Rev.Lett.
Year: 2007
Vol.: 99
Page No: 052002
Pages: 8

Abstract: We report the observation and measurement of the mass of the bottom, strange baryon $\Xi^-_b$ through the decay chain $\Xi^-_b \to J/\psi \Xi^-$, where $J/\psi \to \mu^+ \mu^-$, $\Xi^- \to \Lambda \pi^-$, and $\Lambda \to p \pi^-$. Evidence for observation is based on a signal whose probability of arising from the estimated background is $6.6 \times 10^{-15}$, or 7.7 Gaussian standard deviations. The $\Xi^-_b$ mass is measured to be $5792.9\pm 2.5$ (stat.) $\pm 1.7$ (syst.) MeV/$c^2$.

Keyword(s): baryon hadronic decay ; baryon mass ; Lambda baryons ; meson leptonic decay ; psi mesons ; Xi baryons

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